0=-d^2+10d+5

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Solution for 0=-d^2+10d+5 equation:


Simplifying
0 = -1d2 + 10d + 5

Reorder the terms:
0 = 5 + 10d + -1d2

Solving
0 = 5 + 10d + -1d2

Solving for variable 'd'.

Combine like terms: 0 + -5 = -5
-5 + -10d + d2 = 5 + 10d + -1d2 + -5 + -10d + d2

Reorder the terms:
-5 + -10d + d2 = 5 + -5 + 10d + -10d + -1d2 + d2

Combine like terms: 5 + -5 = 0
-5 + -10d + d2 = 0 + 10d + -10d + -1d2 + d2
-5 + -10d + d2 = 10d + -10d + -1d2 + d2

Combine like terms: 10d + -10d = 0
-5 + -10d + d2 = 0 + -1d2 + d2
-5 + -10d + d2 = -1d2 + d2

Combine like terms: -1d2 + d2 = 0
-5 + -10d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -10d + 5 + d2 = 0 + 5

Reorder the terms:
-5 + 5 + -10d + d2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -10d + d2 = 0 + 5
-10d + d2 = 0 + 5

Combine like terms: 0 + 5 = 5
-10d + d2 = 5

The d term is -10d.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10d + 25 + d2 = 5 + 25

Reorder the terms:
25 + -10d + d2 = 5 + 25

Combine like terms: 5 + 25 = 30
25 + -10d + d2 = 30

Factor a perfect square on the left side:
(d + -5)(d + -5) = 30

Calculate the square root of the right side: 5.477225575

Break this problem into two subproblems by setting 
(d + -5) equal to 5.477225575 and -5.477225575.

Subproblem 1

d + -5 = 5.477225575 Simplifying d + -5 = 5.477225575 Reorder the terms: -5 + d = 5.477225575 Solving -5 + d = 5.477225575 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + d = 5.477225575 + 5 Combine like terms: -5 + 5 = 0 0 + d = 5.477225575 + 5 d = 5.477225575 + 5 Combine like terms: 5.477225575 + 5 = 10.477225575 d = 10.477225575 Simplifying d = 10.477225575

Subproblem 2

d + -5 = -5.477225575 Simplifying d + -5 = -5.477225575 Reorder the terms: -5 + d = -5.477225575 Solving -5 + d = -5.477225575 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + d = -5.477225575 + 5 Combine like terms: -5 + 5 = 0 0 + d = -5.477225575 + 5 d = -5.477225575 + 5 Combine like terms: -5.477225575 + 5 = -0.477225575 d = -0.477225575 Simplifying d = -0.477225575

Solution

The solution to the problem is based on the solutions from the subproblems. d = {10.477225575, -0.477225575}

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